SQL time difference between two dates result in hh:mm:ss

declare @StartDate datetime, @EndDate datetime

select @StartDate="10/01/2012 08:40:18.000",@EndDate="10/04/2012 09:52:48.000"

select convert(varchar(5),DateDiff(s, @startDate, @EndDate)/3600)+':'+convert(varchar(5),DateDiff(s, @startDate, @EndDate)%3600/60)+':'+convert(varchar(5),(DateDiff(s, @startDate, @EndDate)%60)) as [hh:mm:ss]

This query will helpful to you.

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